Adding gerrit request file with request methods

- These methods help facilitate querying gerrit for different statistics
  such as earliest merged commit date and number of merged commits
- Next step will be to incorporate these methods into a few IRC bots

Change-Id: Ic370d48c7d079a40d012bcaa6ae0cda78454e407

statusbot/gerritrequest.py

@@ -0,0 +1,67 @@
+#!/usr/bin/env python
+
+from __future__ import print_function, unicode_literals
+
+import json
+import requests
+
+from dateutil.parser import parse as dparse
+
+BASE_URL = "https://review.openstack.org/changes/?q=%s"
+
+
+def greq(**kwargs):
+    gfilter = []
+    for k, v in kwargs.items():
+        gfilter.append('%s:%s' % (k, v))
+    resp = requests.get(BASE_URL % ' AND '.join(gfilter))
+    return json.loads(resp.text[4:])
+
+
+def get_merged(author):
+    return greq(owner="{%s}" % author, status='merged')
+
+
+def get_abandoned(author):
+    return greq(owner="{%s}" % author, status='abandoned')
+
+
+def earliest_merged(merged):
+    return merged[-1]['submitted'].split()[0]
+
+
+def open_review(merged):
+    longest = None
+    for review in merged:
+        d1 = dparse(review['created'])
+        d2 = dparse(review['submitted'])
+        dt = d2 - d1
+        if not longest or dt > longest:
+            longest = dt
+    return longest.days
+
+
+def lines_added(merged):
+    return sum(map(lambda x: x['insertions'], merged))
+
+
+def lines_deleted(merged):
+    return sum(map(lambda x: x['deletions'], merged))
+
+
+def projects(merged):
+    found = set()
+    map(lambda x: found.add(x['project']), merged)
+    return "\n\t".join(list(sorted(found)))
+
+
+def stats(author):
+    merged = get_merged(author)
+    abandoned = get_abandoned(author)
+    return "\n".join(["Cake Day: %s" % earliest_merged(merged),
+                      "Num Merged: %s" % len(merged),
+                      "Num Abandoned: %s" % len(abandoned),
+                      "Longest Open Merged Review: %s" % open_review(merged),
+                      "Lines Added: %s" % lines_added(merged),
+                      "Lines Deleted: %s" % lines_deleted(merged),
+                      "Projects: %s" % projects(merged)])